On Z-waves detail we see a refresh button and a repair button.
Some times just a refresh button.
What does refresh do. What does repair do. If you do a repair why doesn't the repair button go away.
The repair button is for repairing an individual node in the mesh if there is an issue (this is preferable to doing a whole mesh z-wave repair). The refresh is for refreshing the status of the device within the mesh to see what's up. If the refresh button can't get to the node a remove button will appear but if there is power to that node you won't be able to remove it easily.
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To add to what @rlithgow1 already said, the repair button only appears for mains powered devices (repeaters) and not for battery powered devices.
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The repair button does not indicate the need for a repair, so for a mains powered device it will be there even if the node is healthy.
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I do see repair buttons for my battery operated Yale Lock.
In another thread I confirmed with Bryan Copeland that a FLIRs device will also have a repair button... it's kind of an exception to the battery powered rule. I'm guessing the lock is such a device.
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That would make sense, since a FLiRS device is Frequently Listening, much like a line-powered device.
Other battery powered devices are presumably asleep too much of the time for a repair command to be of any use.
Locks are special 
Why doesn’t the repair button appear for a battery powered device. In the case of a Zooz Zen34 you can press seven times up and activate the device.
If it is not able to be activated or if you want to remove it you can ask if you want to delete the “ghost” mode.
Z-Wave battery operated devices for the most are not always listening but rather wake up when they have something to report. They also have a regular check-in interval but that's usually 12 or 24 hours. This is designed to conserve battery life. This is the reason when you make a configuration change to a battery powered z-wave device you have to wait until they periodically check in for them to receive the new configuration. Since the node is not always listening for commands it will not respond to the hub's attempts to repair the connection. Mains powered devices are always listening (which is why they can be repeaters) and will respond to a repair attempt.
FLIRs devices are a different animal, by the way.
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